Summary Of Significant Accounting Policies (Calculation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Summary Of Significant Accounting Policies [Abstract]
Net income allocable to common shareholders	$ 11,129	$ 9,826	$ 30,901	$ 19,766
Basic weighted average common shares outstanding	26,956	26,899	26,941	26,881
Net effect of dilutive stock compensation - based on treasury stock method using average market price	77	100	86	100
Diluted weighted average common shares outstanding	27,033	26,999	27,027	26,981
Net income per common share - Basic	$ 0.41	$ 0.37	$ 1.15	$ 0.74
Net income per common share - Diluted	$ 0.41	$ 0.36	$ 1.14	$ 0.73